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2 SheetsSheet 1.

(No Model.)

B. P. WARNER. DUPLEX ARC LAMP.

No. 480,050. Patented Aug. 2,'1892..

us ca, m ormumo WAEHANGYON n c (No Model.) 2 SheetsSheet 2. E. P.WARNER. DUPLEX ARC LAMP.

No. 480,050. Patented Aug. 2, 1892.

UNITED STATES PATENT OFFICE.

ERNEST P. W'ARNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE IVESTERNELECTRIC COMPANY, OF SAME PLACE.

DUPLEX ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 480,050, dated August2, 1892. Application filed February 24, 1891. Serial No. 882,362. (Nomodel.)

To all whom it may concern.-

Be it known that I, ERNEST P. WARNER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Switching Devices forDouble-Carbon Arc Lamps, (Case No. 39,) of which the following is afull, clear, concise, and exact description, reference being had to theaccompanying drawings, forming a part of this specification.

My invention relates to double-carbon arc lamps; and its object is toprovide means for shifting the are from one pair of carbons to theother. It has been found desirable in some instances to avoid anyautomatic device used in connection with a single regulating mechanismfor shifting the are to the second pair after the carbons of the firstpair to burn have been practically consumed.

My invention consists in a polarized electro-magnetic device used inconnection with a lamp of the type shown in Letters Patent No. 418,758,granted Charles E. Scribner January 2 5 7, 1890, wherebya momentaryreversal of the current will shift the are from one pair of carbons tothe other. This Scribner lamp contains, as a distinctive feature,retainingmagnets, one for each clutch, and when one set of carbons isburning the carbon-rod of the other set is held up by itsretaining-magnet.

By the use of my invention the circuit may be opened at will through oneretaining-magnet and closed through the other, so as to cause the arc toshift from one pair of carbons to the other.

My invention is of special utility when a large number of lamps areconnected in series upon the same circuit, since by means of acurrent-reversing switch the arcs of all the lamps may be simultaneouslyshifted. Thus after the series of lamps have burned on one side tillmidnight or until one set of carbons is consumed the attendant, bysimply reversing the current for a moment by means of the switch, maybring the unburned pairs of carbons into service, so that the lamps willburn their carbons in succession.

My invention will be more readily understood by reference to theaccompanying drawings, in which- Figure 1 is a diagram illustrative ofan electric-arc lamp of the Scribner type embodying my invention. Fig. 2is a diagram illustrative of the pole-changing switch in connection withan arc-light circuit. Fig. 3 is a view of the polarized electro-magneticcircuit-changing device and means for compelling the trimmer to bringthe parts of the switching device into proper position to cause the arcto form between a particular pair of carbons. Fig. 4 is a plan viewillustrative of the pivoted lever of the switching device.

Like parts are indicated by similar letters of reference throughout thedifferent figures.

In Fig. 1 I have shown the polarized electromagnetic switching deviceplaced above the regulating mechanism of the lamp. This is for clearnessof illustration, since the lamp as a whole may be made more compact byplacing this switching device at the bottom of the case, as illustratedin Fig. 3.

I will now trace the circuit of the lamp as shown in Fig. 1. Beginningat binding-post the circuitmay be traced by Wire a through the coil ofthe polarized magnet 17, and thence through the coarse-wirelifting-magnet c, and thence to the frame of the lamp. From the frame ofthe lamp the circuit is continued to the carbon-rods d d. As shown inthe drawings, the circuit extends from carbon-rod (I through its pair ofcarbons, and thence through retaining-magnet e, and thence through thepolarized switch-levers ff and thence out at binding-post It will beobserved that the carbon-rod d is in open circuit for tracing thecircuit from carbon-rod at through its carbons, and thence throughretaining-magnet e we shall find the circuit open at contact g, which isplaced in proper relation to pivoted lever f as to be in the paththereof when said pivoted lever f is liberated on the withdrawal oflever f.

I do not deem it necessary to describe in de tail the action of thefeeding-magnet h or that of the clutch-levers and clutches, sinceeverything will be found described in detail in the said Scribnerpatent.

The dynamo '1; in Fig. 2 is shown supplying the circuit is, in which areplaced arc lamps. The pole-changing switch Z, placed at .the centralstation, is adapted to reverse the current at the will of the attendant.

In my patent, No. 420,422, granted January 28, 1890, I have shown thecombination, with the electro-magnet included in a circuit, of a pivotedpermanent magnet, one pole of said electro-magnet being placed betweenthe opposite poles of said permanent magnet, said permanent magnet beingadapted to take one position or another, according to the direction ofthe current through the coils of the electromagnet. I preferably employsuch a device as a part of my polarized electro-magnetic switchingdevice or commutator, as illustrated in Figs. 1 and 3.

As fully described in my said patent, it is apparent that the lever fwill take one position or another, according to the direction of thecurrent. In this manner the circuit through the carbons of rod cl may beopened between the levers f f by simply reversing for a moment thedirection of the current through the coil 6. The same movement of leverf serves to liberate the pivoted lever f and permits said pivoted leverf to be carried by the force of its retractile spring against contact g,so as to close the circuit immediately through the carbons of rod (1.The are being thus transferred to the other set of carbons, the currentshould be brought back to its proper direction, so that the carbons maybe consumed in proper ratio. In this manner when the carbons of rod dare practically consumed the arc may be shifted to the other set-thatis, to the carbons of rod 01.

It will be noted that when the current is changed to its original andnormal direction after the transfer of the arc the pivoted lever f,having been carried out of the path of the lever f, can no longer engagetherewith or form contact therewith, no matter what its position may be,until replaced by hand.

In Fig. 3 I have shown rod d provided with a disk or projection m, whichwhen raised in the act of carboning the lamp forces a rod 17. up againstthe pivoted lever f thereby bringing it into engagement with the leveror detent f. The trimmer is thus made to automatically restore theconnection between levers ff, so as to bring the lamp into its properinitial adjustment ready to be started when the current is established.

My invention may be applied to lamps in which no retaining-magnets areemployed, and I therefore do not limit my invention to any particularform or construction of doublecarbon lamp. The feature of my inventionwhich I consider novel and important is the use of a polarizedelectro-magnetic switching device, whereby the arc may be shifted fromone pair of carbons to the other by a momentary reversal of the current.

My invention may be employed in connection with two complete singlelamps for causing them to burn in succession, the mode of action andconstruction of the switch being substantially that illustrated anddescribed herein. It is evident that other forms of polarized magnetsmight be employed, though I consider the form illustrated in my saidpatent specially adapted to do the work.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination, with two pairs of carbons placedin derived circuit, of a unitary electro-magnetic device for controllingthe same and a polarized electro-magnetic switching device or commutatoradapted upon the reversal of the current to transfer the are from onepair of carbons to the other.

2. The combination, with two independently-adjustable carbon rods andunitary means for automatically controlling the same, of a polarizedelectro-magnetic switching device for shifting the are from the carbonsof one rod to the other on the reversal of the current, substantially asand for the purpose specified.

3. The combination, with one of two independently-adj ustablecarbon-rods, of a disk m,

secured thereto, and a rod n, against which the 5 ERNEST P. WARNER.IVitnesses:

ELLA EDLER, GEORGE L. CRAGG.

